Construction of caffeic acid modified porous starch as the dual-functional microcapsule for encapsulation and antioxidant property.

A dual-functional food-grade microcapsule, which was constructed by caffeic acid and porous starch was obtained. Caffeic acid modified porous starch (CA-PS) was accordingly synthesized successfully by esterification. Carbonyl signal observed by C solid state NMR (170 ppm) and FT-IR (1745 cm), indicating the formation of ester bond.